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import pytest
from pycallgraph2 import PyCallGraphException
from pycallgraph2.tracer import AsynchronousTracer, SynchronousTracer
def test_start_no_outputs(pycg):
with pytest.raises(PyCallGraphException):
pycg.start()
def test_with_block_no_outputs(pycg):
with pytest.raises(PyCallGraphException):
with pycg:
pass
def test_get_tracer_class(pycg):
pycg.config.threaded = True
assert pycg.get_tracer_class() == AsynchronousTracer
pycg.config.threaded = False
assert pycg.get_tracer_class() == SynchronousTracer
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